EP0376676B1 - Rotary substrate for a rotary blade - Google Patents
Rotary substrate for a rotary blade Download PDFInfo
- Publication number
- EP0376676B1 EP0376676B1 EP89313586A EP89313586A EP0376676B1 EP 0376676 B1 EP0376676 B1 EP 0376676B1 EP 89313586 A EP89313586 A EP 89313586A EP 89313586 A EP89313586 A EP 89313586A EP 0376676 B1 EP0376676 B1 EP 0376676B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- slits
- substrate
- rotary
- blade
- circumference
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000000758 substrate Substances 0.000 title claims description 74
- 239000000945 filler Substances 0.000 claims description 20
- 230000002093 peripheral effect Effects 0.000 claims 1
- 238000010276 construction Methods 0.000 description 14
- 239000000057 synthetic resin Substances 0.000 description 9
- 229920003002 synthetic resin Polymers 0.000 description 9
- 238000005520 cutting process Methods 0.000 description 8
- 238000013016 damping Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 238000005266 casting Methods 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 150000002739 metals Chemical class 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 229910003460 diamond Inorganic materials 0.000 description 3
- 239000010432 diamond Substances 0.000 description 3
- 238000000227 grinding Methods 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000004663 powder metallurgy Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 239000010425 asbestos Substances 0.000 description 1
- 239000010426 asphalt Substances 0.000 description 1
- 238000005219 brazing Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000002075 main ingredient Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000004848 polyfunctional curative Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 229910052895 riebeckite Inorganic materials 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
- B28D1/02—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing
- B28D1/12—Saw-blades or saw-discs specially adapted for working stone
- B28D1/121—Circular saw blades
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D61/00—Tools for sawing machines or sawing devices; Clamping devices for these tools
- B23D61/02—Circular saw blades
- B23D61/021—Types of set; Variable teeth, e.g. variable in height or gullet depth: Varying pitch; Details of gullet
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D61/00—Tools for sawing machines or sawing devices; Clamping devices for these tools
- B23D61/02—Circular saw blades
- B23D61/025—Details of saw blade body
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D61/00—Tools for sawing machines or sawing devices; Clamping devices for these tools
- B23D61/02—Circular saw blades
- B23D61/04—Circular saw blades with inserted saw teeth the teeth being individually inserted
- B23D61/06—Circular saw blades with inserted saw teeth the teeth being individually inserted in exchangeable arrangement
Definitions
- the present invention relates to a rotary substrate for use in a blade and a rotary blade using said substrate aiming at a damping of noises generated during a rotation and a construction of a blade useful for cutting a stone, concrete, asphalt and the like.
- a rotary blade capable of damping noises has been disclosed in Japanese Patent Publication No. Sho 50-10040.
- a plurality of grooves having a suitable width, for example 1.5 mm, and a suitable length, for example about 10 % of an outside diameter of a saw member are formed at regular intervals from the vicinity of a base portion toward almost a center of the blade on a circumferential edge of the rotary substrate and said respective grooves are filled with setting synthetic resins having a hardness lower than that of the rotary substrate to fixedly mount said setting synthetic resins on the grooves.
- a plurality of grooves are formed from the vicinity of the base portion toward almost the center of the blade portion and filled with setting synthetic resins having a hardness lower than that of this blade to act as a buffer zone for the propagation of vibration, whereby partially stopping the propagation of vibration in the rotary substrate, and thus reducing also the resonance.
- the buffer zone of vibration is arranged in a radial direction from the center, so that the vibration resulting from the blade portion is damped in the circumferential direction on the rotary substrate but the vibration generated in the blade portion is reflected in the central portion, whereby the generated vibration can not be sufficiently damped.
- FR-A-2 118 263 discloses a rotary substrate for a rotary blade having a plurality of radially extending slits each of which is joined at one of its extremities to the extremity of at least one other radial slit by a slitted region formed as a segment of a circle centred on the central axis of the rotary substrate. Since alternate groups of the radial slits are respectively joined at their outer ends and at their inner ends, the configuration formed by the series of interconnected slits overlap in both the radial and circumferential directions.
- the invention consists in a rotary substrate for a rotary blade, wherein said substrate is of circular plate-like form and has two sets of slits extending therethrough, comprising a plurality of circumferentially extending first slits formed at regular intervals about a first outer circumference adjacent the periphery of the rotary substrate and a plurality of circumferentially extending second slits formed about a second inner circumference positioned inside of the first slits and overlapping adjacent first slits in the circumferential direction characterized in that the shape of both said first slits and said second slits, as seen from the side of the substrate, is substantially semi-circular with the first slits lying radially outwardly of said first circumference and the second slits lying radially inwardly of said second circumference and such that said first slits lie between their centre of curvature and the outer periphery of said substrate and said second slits lie between their centre of curvature and the centre of
- grooves formed between the blades carried at the outer periphery of said substrate are also filled with the filler in a similar manner to integrate the rotary blade.
- Fig. 1 shows the whole of the rotary substrate for use in the blade according to the present invention.
- Reference numeral 1 designates a rotary substrate formed of a punched steel plate or stainless steel plate in a circular shape, reference numeral 2 designating an axial hole formed at a center of said rotary substrate 1, reference numeral 3 designating a blade or tooth, and reference numerals 4, 5 designating first and second semicircular slits, respectively.
- Fig. 2 (a) is an enlarged view showing a portion surrounded by B - B in Fig. 1 and Fig. 2 (b) is an enlarged sectional view of Fig. 1 taken along the line A - A thereof.
- reference numeral 6 designates fillers.
- first slits 4 and 12 second slits 5 are formed.
- a thickness of the substrate is for example 4 to 9.5 mm and a diameter is for example 30 to 100 inches (75 to 254 cm).
- a first circumference 7 is set up in the vicinity of an outer edge of the rotary substrate 1 with a center of the rotary substrate 1 as 0 and 24 semicircular slits 4 are formed all over an outside circumference of said first circumference 7 with this as the standard.
- an interval d between ends 9, 9′ of adjacent slits 4 is set so as to be smaller than 2 times an inside radius r of the formed semicircular slits 4.
- the respective semicircular slits 4 have a shape opened in a direction toward the center 0 of the rotary substrate 1 and may have a circular arc slightly larger or smaller than a semicircle.
- These semicircular slits 4 are formed by means of a laser processing machine so as to be made round at both end portions thereof and a slit width of about 0.4 mm is suitable.
- the slits which have been formed in the above described manner, are referred to as the first semicircular slits.
- a second circumference 8 is set up inside of said first circumference 7 with the center 0 as a fundamental point and 12 semicircular slits 5, which are opened in a direction opposite to the direction in which the adjacent slits 4 are opened (opened outward) and simultaneously cross over both end portions 9, 9′ to partially interrupt the direction, in which both adjacent slits 4, 4 are opened, are formed for every two adjacent slits 4, 4 inside of the circumference 8 with this circumference 8 and radii connecting both end portions 9, 9′ of said first adjacent semicircular slits 4 with the center 0 of the substrate as standards.
- the processing and the width of the slits 5 are same as those of the slits 4.
- a difference l between the first circumference 7 and the circumference 8 in diameter is dependent upon a mechanical strength of the rotary substrate 1 when subjected to a cutting load.
- Such shape and arrangement of the slits lead to the possibility that the whole length of the slits themselves can be increased without decreasing the rigidity of the substrate (the rigidity of the substrate for holding the blade within an appointed plane during the high-speed rotary grinding), whereby increasing a quantity of fillers and improving the sound damping effect.
- the semicircular slits 4 and 5 may be same or slightly different in diameter.
- All of the semicircular slits 4, 5 are filled with fillers obtained by compounding heat resistant, pressure resistant and shake-proof sealing agents to synthetic resins .
- the synthetic resins to be filled of which hardness can be regulated ranging from the rigid state to the flexible state, and which have a water-proofness to such an extent that they are difficultly soluble also in a cutting water, a strong adhesion to metals to such an extent that they are not fallen out by a centrifugal force due to the high rotation frequency and a low viscosity required for easy filling, are most suitable, and the sealing agents containing for example asbestos and glass fibers are used.
- Said fillers are adapted to have a hardness lower than that of the rotary substrate after set.
- the blade 3 is formed by fixedly brazing and welding chips, which have been obtained by sintering diamond particles integrally with metals, to stand portions formed by U-shaped grooves 10 formed on an outer edge of the substrate 1 at regular intervals or by a cassette construction.
- the cutting chip has been directly fixed to the substrate in many cases but as disclosed in for example Japanese Utility Model Laid-Open No. Sho 62-198058, the chip, which is detachable by means of a fixture, and the chip having a dovetail groove type cassette construction have been known.
- the chip having a dovetail groove type cassette construction easily detachable as shown in Fig. 6 is most easily used.
- disadvantages have occurred in that a female die of a cassette stand 22 is apt to be opened to be unstable in strength under the severe operating conditions and both sides 29, 29′ of a male die and the female die are subjected to a taper machining , so that the accuracy is apt to be fluctuated and their engagement position is apt to be not fixed.
- the blade having a cassette construction can not be produced by casting but must be produced by machining, so that the cost is increased.
- the cassette construction of the blade which is one of the present inventions, has solved the problems described in the preceding page by changing the conventional dovetail groove type cassette, that is an up and down engagement, to the side surface engagement by means of a stand having a ⁇ letter-shaped section.
- the rotary substrates (usual substrates) having diameters of 40, 60, 72, 80 and 100 inches (about 100 to 254 cm) and thicknesses of 5.0 to 7.0 and 6.59 to 9.0 mm, said substrates with 24 first semicircular slits and 12 second semicircular slits having a width of 0.2 mm formed thereon (slitted substrates) and said substrates, in which all slits are filled with fillers comprising low-viscosity flexibility-adjustable epoxy molding resins as a main ingredient of 40 or more by weight, a hardener of 55 or less by weight and a heat resistant, pressure resistant and shake-proof sealing agent of 10 to 15 % by weight, which are subsequently set, (resin-filled substrates) were produced and tested on sound damping effect. The results are shown in Table 1.
- a measuring distance was set at 1 m in a low-noise room and the A scale of NA-09 manufactured by Rione, Ltd. was used for the measurement.
- the rotary substrate having the size of 40 inches (about 100 cm), which is shown in said Table 1, with four grooves of 1.5 mm wide and 4 inches (about 10 cm) long shown in said publication formed from the vicinity of the base portion of the saw-toothed portion toward the center and then filled with the synthetic resin fillers having the same composition as said fillers was produced and tested on sound damping effect under the same conditions with the result of 94 dB.
- Fig. 3(a) shows a portion corresponding to the circumferential blade of the substrate shown in Fig. 1.
- Reference numeral 10 designates U-shaped grooves, slots or notches formed on the outer edge of the substrate 1 at regular intervals which let ground powders go and serve as radiating portions.
- Chips 12 obtained by sintering diamond powders integrally with metals or by sintering tungsten carbide are fixedly brazed and welded to the whole stand 11 formed of said U -shaped grooves 10 to form the blade or the blade is formed by the cassette construction.
- the U letter-shaped grooves 10 are filled with fillers 6 having the same composition as the fillers used in said description. However, their composition may be not always same as that of the fillers used in said description.
- an upper surface 13 of the fillers 6 is adapted to be within the groove and leave the groove having room for depth between the preceding chip 12 and the subsequent chip 12.
- Fig. 3(b) shows the rotary blade provided with a key groove or slot 14 in place of the U-shaped groove in said preferred embodiment shown in Fig. 3(a).
- the fillers 6 both are same.
- first semicircular slits and 12 second semicircular slits were formed on the rotary substrate having a diameter of 40 inches and a thickness of 5.0 mm according to said TEST EXAMPLE, the respective slits being filled with fillers, chips being fixedly mounted on the whole stand portion on the circumference of the rotary substrate, and U letter-shaped grooves being filled with the fillers to produce a rotary blade by way of trial.
- the resulting rotary blade was rotated at 550 r.p.m. without applying a grinding load with the result that the noise amounted to 92 dB as measured by the same method as in said TEST EXAMPLE 1 for both the rotary substrate and the rotary blade.
- reference numeral 23 designates an outside portion of a substrate of a blade made of an iron plate and the like, a cassette stand 22 having a ⁇ letter-shaped section being fixedly mounted on an end face of said outside portion 23 of the substrate by welding and the like.
- Reference numeral 21 designates cutting chips obtained by bonding super grinding material particles, such as diamond particles, with metals.
- a cassette stand 22 having a ⁇ letter-shaped section is fixedly mounted on an inside end face of said cutting chips 22.
- Both cassette stands 22, 22 have one side of two upper and lower sides longer than the other side so that they may be intertwinedly engaged with each other at ⁇ letter-shaped portions thereof and they are fixedly mounted on a substrate and a chip, respectively, on an outside of the longer side.
- An acute-angled taper 24 is formed in a sectional direction and a tapered surface 25 inclined in an opposite direction in correspondence to said acute-angled taper 24 is formed in a longitudinal direction on an inside of the longer side.
- the shorter side 27 is engagedly put in a ⁇ letter-shaped concave portion 26 of the other party, so that a plane 28 corresponding to said taper 24 and said tapered surface 25 in the sectional direction and a direction meeting at right angles with the sectional direction is formed.
- a plurality of cassette stands 22 are fixedly mounted on an outside end of the substrate 23 at intervals, as shown in Figs. 4, 5, but the tapered direction of the tapered surface 25 is same one.
- the cassette stands 22 fixedly mounted on a large number of cutting chips 21 are taperedly engaged with the substrate 23 in a direction shown by an arrow in Fig. 4 to be bonded integrally with the substrate 23.
- the cassette stand having the above described construction can be easily produced by shaving soft steel materials and the like, the powder metallurgy and the casting.
- taper 24 in the sectional direction is formed on two ⁇ letter-shaped sides and the tapered surface 25 in the direction meeting at right angles with the sectional direction is formed on merely one side, the contrary arrangement may be adopted and also the tapered surface 25 may be formed on two sides.
- the present invention can not exhibit the effects thereof until the formed semicircular slits are filled with the fillers containing the synthetic resins and the sealing agents to integrate the semicircular slits with the substrate.
- the rotary substrate according to the present invention exhibits a sufficient sound damping effect in comparison with the conventional rotary substrate in which the grooves extending toward the center are filled with the synthetic resins.
- the rotary blade in which the rotary substrate according to the present invention is used, the blade being fixedly mounted on the stand portion formed on the circumference of the substrate, and the grooves between the blades being filled with the fillers, exhibits a sufficient sound damping effect in the above described manner and can improve the working environment where this kind of rotary blade is used.
- the cassette construction of the blade is achieved by the side surface engagement, in which the ⁇ letter-shaped insides of the cassette stands having a ⁇ letter-shaped section are intertwined, so that it is more stable in comparison with the conventional up and down engagement by means of the dovetail grooves and can be easily produced in higher dimensional accuracy, whereby being capable of stably using without difficulty in the installation and detachment thereof.
Description
- The present invention relates to a rotary substrate for use in a blade and a rotary blade using said substrate aiming at a damping of noises generated during a rotation and a construction of a blade useful for cutting a stone, concrete, asphalt and the like.
- A rotary blade capable of damping noises has been disclosed in Japanese Patent Publication No. Sho 50-10040. In this rotary blade, a plurality of grooves having a suitable width, for example 1.5 mm, and a suitable length, for example about 10 % of an outside diameter of a saw member, are formed at regular intervals from the vicinity of a base portion toward almost a center of the blade on a circumferential edge of the rotary substrate and said respective grooves are filled with setting synthetic resins having a hardness lower than that of the rotary substrate to fixedly mount said setting synthetic resins on the grooves.
- It has been described that according to this construction, low sound waves generated from said setting synthetic resin layer interfere with sound waves generated from the blade to hinder the tuning and resonance of sound waves, whereby changing simple high sounds to complicated low sounds, and thus high and sharp metal sounds are deadened, as a whole.
- It is thought that actually the blade formed in the circumferential portion of the rotary substrate is rotated in high speed to produce a turbulent air flow, whereby generating sounds, and the blade receives an external force resulting from the generation of this turbulent flow to be vibrated, or receives an external force resulting from a load on a material to be cut to be compulsorily vibrated, and thus this vibration is resonant with the vibration of the rotary substrate to generate large sounds. In this respect, it seems that according to said Japanese Patent Publication No. Sho 50-10040, a plurality of grooves are formed from the vicinity of the base portion toward almost the center of the blade portion and filled with setting synthetic resins having a hardness lower than that of this blade to act as a buffer zone for the propagation of vibration, whereby partially stopping the propagation of vibration in the rotary substrate, and thus reducing also the resonance.
- However, according to said Japaneses Patent Publication Sho 50-10040, the buffer zone of vibration is arranged in a radial direction from the center, so that the vibration resulting from the blade portion is damped in the circumferential direction on the rotary substrate but the vibration generated in the blade portion is reflected in the central portion, whereby the generated vibration can not be sufficiently damped.
- FR-A-2 118 263 discloses a rotary substrate for a rotary blade having a plurality of radially extending slits each of which is joined at one of its extremities to the extremity of at least one other radial slit by a slitted region formed as a segment of a circle centred on the central axis of the rotary substrate. Since alternate groups of the radial slits are respectively joined at their outer ends and at their inner ends, the configuration formed by the series of interconnected slits overlap in both the radial and circumferential directions.
- However, because of the number and extent of the slits the overall mechanical strength of the rotary substrate is considerably weakened.
- It is an object of the present invention to damp the vibration resulting from the blade (saw toothed-portion) in the circumferential portion of the rotary substrate causing the increased vibration in not only the circumferential direction on the rotary substrate but also the direction toward the center from the circumferential portion of the rotary substrate.
- The invention consists in a rotary substrate for a rotary blade, wherein said substrate is of circular plate-like form and has two sets of slits extending therethrough, comprising a plurality of circumferentially extending first slits formed at regular intervals about a first outer circumference adjacent the periphery of the rotary substrate and a plurality of circumferentially extending second slits formed about a second inner circumference positioned inside of the first slits and overlapping adjacent first slits in the circumferential direction characterized in that the shape of both said first slits and said second slits, as seen from the side of the substrate, is substantially semi-circular with the first slits lying radially outwardly of said first circumference and the second slits lying radially inwardly of said second circumference and such that said first slits lie between their centre of curvature and the outer periphery of said substrate and said second slits lie between their centre of curvature and the centre of rotation of said substrate, that is to say said first slits and said second slits have their open sides facing each other and in that said first slits and said second slits do not overlap in the radial direction and that the radial distance (ℓ) between them is greater than 0, said slits being filled with a filler to integrate the slits with the rotary substrate.
- In addition, according to a preferred embodiment of the present invention, grooves formed between the blades carried at the outer periphery of said substrate are also filled with the filler in a similar manner to integrate the rotary blade.
- In the accompanying drawings.
- Fig. 1 is a plan view showing a preferred embodiment of a rotary substrate for use in a blade according to the present invention;
- Fig. 2(a) is an enlarged view showing a B - B portion in Fig. 1;
- Figure 2(b) is an enlarged sectional view of Fig. 1 taken along the line A - A thereof;
- Fig. 3(a), (b) is a diagram showing a preferred embodiment of a rotary blade according to the present invention;
- Fig. 4 is a perspective view describing a cassette structure of the blade;
- Fig. 5 is a side view of Fig. 4; and
- Fig. 6 is a side view showing the conventional cassette structure.
- The present invention will be below described in more detail with reference to a preferred embodiment shown in the drawings.
- Fig. 1 shows the whole of the rotary substrate for use in the blade according to the present invention.
-
Reference numeral 1 designates a rotary substrate formed of a punched steel plate or stainless steel plate in a circular shape,reference numeral 2 designating an axial hole formed at a center of saidrotary substrate 1,reference numeral 3 designating a blade or tooth, andreference numerals 4, 5 designating first and second semicircular slits, respectively. - Fig. 2 (a) is an enlarged view showing a portion surrounded by B - B in Fig. 1 and Fig. 2 (b) is an enlarged sectional view of Fig. 1 taken along the line A - A thereof. Referring to Fig. 2,
reference numeral 6 designates fillers. - As shown in Fig. 1, in the present preferred
embodiment 24 first slits 4 and 12second slits 5 are formed. A thickness of the substrate is for example 4 to 9.5 mm and a diameter is for example 30 to 100 inches (75 to 254 cm). - A
first circumference 7 is set up in the vicinity of an outer edge of therotary substrate 1 with a center of therotary substrate 1 as 0 and 24 semicircular slits 4 are formed all over an outside circumference of saidfirst circumference 7 with this as the standard. In this time, an interval d betweenends - The respective semicircular slits 4 have a shape opened in a direction toward the center 0 of the
rotary substrate 1 and may have a circular arc slightly larger or smaller than a semicircle. - These semicircular slits 4 are formed by means of a laser processing machine so as to be made round at both end portions thereof and a slit width of about 0.4 mm is suitable.
- The slits, which have been formed in the above described manner, are referred to as the first semicircular slits.
- Subsequently, a
second circumference 8 is set up inside of saidfirst circumference 7 with the center 0 as a fundamental point and 12semicircular slits 5, which are opened in a direction opposite to the direction in which the adjacent slits 4 are opened (opened outward) and simultaneously cross over bothend portions circumference 8 with thiscircumference 8 and radii connecting bothend portions - The processing and the width of the
slits 5 are same as those of the slits 4. - In the above described case, a difference ℓ between the
first circumference 7 and thecircumference 8 in diameter is dependent upon a mechanical strength of therotary substrate 1 when subjected to a cutting load. - Such shape and arrangement of the slits lead to the possibility that the whole length of the slits themselves can be increased without decreasing the rigidity of the substrate (the rigidity of the substrate for holding the blade within an appointed plane during the high-speed rotary grinding), whereby increasing a quantity of fillers and improving the sound damping effect.
- In addition, the
semicircular slits 4 and 5 may be same or slightly different in diameter. - All of the
semicircular slits 4, 5 are filled with fillers obtained by compounding heat resistant, pressure resistant and shake-proof sealing agents to synthetic resins . The synthetic resins to be filled, of which hardness can be regulated ranging from the rigid state to the flexible state, and which have a water-proofness to such an extent that they are difficultly soluble also in a cutting water, a strong adhesion to metals to such an extent that they are not fallen out by a centrifugal force due to the high rotation frequency and a low viscosity required for easy filling, are most suitable, and the sealing agents containing for example asbestos and glass fibers are used. Said fillers are adapted to have a hardness lower than that of the rotary substrate after set. - Besides, referring to Fig. 1 and Fig. 2 (a), (b), the
blade 3 is formed by fixedly brazing and welding chips, which have been obtained by sintering diamond particles integrally with metals, to stand portions formed byU-shaped grooves 10 formed on an outer edge of thesubstrate 1 at regular intervals or by a cassette construction. - Here, the cassette construction of the blade is in detail described. The cutting chip has been directly fixed to the substrate in many cases but as disclosed in for example Japanese Utility Model Laid-Open No. Sho 62-198058, the chip, which is detachable by means of a fixture, and the chip having a dovetail groove type cassette construction have been known.
- Of the conventional chips, the chip having a dovetail groove type cassette construction easily detachable as shown in Fig. 6 is most easily used. However, according to this construction, disadvantages have occurred in that a female die of a
cassette stand 22 is apt to be opened to be unstable in strength under the severe operating conditions and bothsides - The cassette construction of the blade, which is one of the present inventions, has solved the problems described in the preceding page by changing the conventional dovetail groove type cassette, that is an up and down engagement, to the side surface engagement by means of a stand having a ⊐ letter-shaped section.
- The rotary substrates (usual substrates) having diameters of 40, 60, 72, 80 and 100 inches (about 100 to 254 cm) and thicknesses of 5.0 to 7.0 and 6.59 to 9.0 mm, said substrates with 24 first semicircular slits and 12 second semicircular slits having a width of 0.2 mm formed thereon (slitted substrates) and said substrates, in which all slits are filled with fillers comprising low-viscosity flexibility-adjustable epoxy molding resins as a main ingredient of 40 or more by weight, a hardener of 55 or less by weight and a heat resistant, pressure resistant and shake-proof sealing agent of 10 to 15 % by weight, which are subsequently set, (resin-filled substrates) were produced and tested on sound damping effect. The results are shown in Table 1.
- In addition, a measuring distance was set at 1 m in a low-noise room and the A scale of NA-09 manufactured by Rione, Ltd. was used for the measurement.
Table 1 Size (inch) cm Usual subst. Slitted subst. Resin-filled subst. Rotation frequency r.p.m. 101.6cm (40in) 101 dB 101 dB 92 dB 550 152.4cm (60in) 101 dB 102 dB 91 dB 350 182.88cm(72in) 102 dB 102 dB 91 dB 300 203.2cm (80in) 102 dB 102 dB 91 dB 300 254cm (100in) 103 dB 104 dB 92 dB 230 - On the other hand, the rotary substrate having the size of 40 inches (about 100 cm), which is shown in said Table 1, with four grooves of 1.5 mm wide and 4 inches (about 10 cm) long shown in said publication formed from the vicinity of the base portion of the saw-toothed portion toward the center and then filled with the synthetic resin fillers having the same composition as said fillers was produced and tested on sound damping effect under the same conditions with the result of 94 dB.
- Next, the rotary blade according to the present invention using said slitted substrate is described with reference to Fig. 3(a), (b).
- Fig. 3(a) shows a portion corresponding to the circumferential blade of the substrate shown in Fig. 1.
Reference numeral 10 designates U-shaped grooves, slots or notches formed on the outer edge of thesubstrate 1 at regular intervals which let ground powders go and serve as radiating portions. Chips 12 obtained by sintering diamond powders integrally with metals or by sintering tungsten carbide are fixedly brazed and welded to thewhole stand 11 formed of said U -shapedgrooves 10 to form the blade or the blade is formed by the cassette construction. - According to the present invention, subsequently, the U letter-shaped
grooves 10 are filled withfillers 6 having the same composition as the fillers used in said description. However, their composition may be not always same as that of the fillers used in said description. In this case, an upper surface 13 of thefillers 6 is adapted to be within the groove and leave the groove having room for depth between the preceding chip 12 and the subsequent chip 12. - Fig. 3(b) shows the rotary blade provided with a key groove or
slot 14 in place of the U-shaped groove in said preferred embodiment shown in Fig. 3(a). As to thefillers 6, both are same. - Thus, the rotary blade is formed.
- 24 first semicircular slits and 12 second semicircular slits were formed on the rotary substrate having a diameter of 40 inches and a thickness of 5.0 mm according to said TEST EXAMPLE, the respective slits being filled with fillers, chips being fixedly mounted on the whole stand portion on the circumference of the rotary substrate, and U letter-shaped grooves being filled with the fillers to produce a rotary blade by way of trial. The resulting rotary blade was rotated at 550 r.p.m. without applying a grinding load with the result that the noise amounted to 92 dB as measured by the same method as in said TEST EXAMPLE 1 for both the rotary substrate and the rotary blade.
- The latter was ground with loading with the result that the noise amounted to 100 dB as measured in the same manner. It was found from this that the noise was reduced by about 10 dB or more in comparison with that of the conventional rotary substrate having the same shape and subjected to no sound damping measure.
-
- Referring to Figs. 4, 5,
reference numeral 23 designates an outside portion of a substrate of a blade made of an iron plate and the like, acassette stand 22 having a ⊐ letter-shaped section being fixedly mounted on an end face of said outsideportion 23 of the substrate by welding and the like.Reference numeral 21 designates cutting chips obtained by bonding super grinding material particles, such as diamond particles, with metals. A cassette stand 22 having a ⊐ letter-shaped section is fixedly mounted on an inside end face of said cuttingchips 22. Both cassette stands 22, 22 have one side of two upper and lower sides longer than the other side so that they may be intertwinedly engaged with each other at ⊐ letter-shaped portions thereof and they are fixedly mounted on a substrate and a chip, respectively, on an outside of the longer side. - An acute-angled
taper 24 is formed in a sectional direction and atapered surface 25 inclined in an opposite direction in correspondence to said acute-angledtaper 24 is formed in a longitudinal direction on an inside of the longer side. - The
shorter side 27 is engagedly put in a ⊐ letter-shapedconcave portion 26 of the other party, so that aplane 28 corresponding to saidtaper 24 and said taperedsurface 25 in the sectional direction and a direction meeting at right angles with the sectional direction is formed. - In addition, a plurality of cassette stands 22 are fixedly mounted on an outside end of the
substrate 23 at intervals, as shown in Figs. 4, 5, but the tapered direction of the taperedsurface 25 is same one. - And, the cassette stands 22 fixedly mounted on a large number of cutting
chips 21 are taperedly engaged with thesubstrate 23 in a direction shown by an arrow in Fig. 4 to be bonded integrally with thesubstrate 23. - It goes without saying that a direction of rotation or direction of advance of the substrate during the cutting is opposite to the direction shown by the arrow and the bonding strength is high. The cassette stand having the above described construction can be easily produced by shaving soft steel materials and the like, the powder metallurgy and the casting.
- In addition, although the
taper 24 in the sectional direction is formed on two ⊐ letter-shaped sides and the taperedsurface 25 in the direction meeting at right angles with the sectional direction is formed on merely one side, the contrary arrangement may be adopted and also the taperedsurface 25 may be formed on two sides. -
- As obvious from the above described results, the present invention can not exhibit the effects thereof until the formed semicircular slits are filled with the fillers containing the synthetic resins and the sealing agents to integrate the semicircular slits with the substrate. In addition, it can be found that the rotary substrate according to the present invention exhibits a sufficient sound damping effect in comparison with the conventional rotary substrate in which the grooves extending toward the center are filled with the synthetic resins.
- In addition, the rotary blade, in which the rotary substrate according to the present invention is used, the blade being fixedly mounted on the stand portion formed on the circumference of the substrate, and the grooves between the blades being filled with the fillers, exhibits a sufficient sound damping effect in the above described manner and can improve the working environment where this kind of rotary blade is used.
- Furthermore, the cassette construction of the blade is achieved by the side surface engagement, in which the ⊐ letter-shaped insides of the cassette stands having a ⊐ letter-shaped section are intertwined, so that it is more stable in comparison with the conventional up and down engagement by means of the dovetail grooves and can be easily produced in higher dimensional accuracy, whereby being capable of stably using without difficulty in the installation and detachment thereof.
- Besides, in respect of the construction, not only it is easier in shaving in the machining in comparison with the dovetail grooves but also it can be produced also by the powder metallurgy using a press mold and the casting using a casting mold, so that also the cost of production can be reduced.
Claims (4)
- A rotary substrate (1) for a rotary blade, wherein said substrate is of circular plate-like form and has two sets of slits extending therethrough, comprising a plurality of circumferentially extending first slits (4) formed at regular intervals about a first outer circumference adjacent the periphery of the rotary substrate and a plurality of circumferentially extending second slits (5) formed about a second inner circumference positioned inside of the first slits and overlapping adjacent first slits in the circumferential direction characterized in that the shape of both said first slits (4) and said second slits (5), as seen from the side of the substrate, is substantially semicircular with the first slits lying radially outwardly of said first circumference (7) and the second slits lying radially inwardly of said second circumference (8) and such that said first slits (4) lie between their centre of curvature and the outer periphery of said substrate and said second slits (5) lie between their centre of curvature and the centre of rotation (2) of said substrate, that is to say said first slits and said second slits have their open sides facing each other, and in that said first slits and said second slits do not overlap in the radial direction and that the radial distance (ℓ) between them is greater than 0, said slits (4,5) being filled with a filler (6) to integrate the slits with the rotary substrate.
- A rotary substrate as claimed in claim 1, characterised in that the number of said first slits is twice the number of said second slits.
- A rotary blade comprising a rotary substrate (1) as claimed in claim 1 or 2, characterized by a plurality of grooves (10,14) formed in the peripheral edge of the substrate and a blade or tooth (3) mounted on the stands formed between the grooves.
- A rotary blade as claimed in claim 3, characterized in that the grooves (10,14) are filled with filler (6).
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP169720/88 | 1988-12-27 | ||
JP16972088U JPH0639889Y2 (en) | 1988-12-27 | 1988-12-27 | Cutting blade cassette structure |
JP335561/88 | 1988-12-28 | ||
JP33556188A JPH02180564A (en) | 1988-12-28 | 1988-12-28 | Rotating substrate for blade and rotating blade |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0376676A2 EP0376676A2 (en) | 1990-07-04 |
EP0376676A3 EP0376676A3 (en) | 1990-11-28 |
EP0376676B1 true EP0376676B1 (en) | 1994-07-20 |
Family
ID=26492971
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP89313586A Expired - Lifetime EP0376676B1 (en) | 1988-12-27 | 1989-12-27 | Rotary substrate for a rotary blade |
Country Status (4)
Country | Link |
---|---|
US (1) | US5012792A (en) |
EP (1) | EP0376676B1 (en) |
DE (1) | DE68916930T2 (en) |
ES (1) | ES2056234T3 (en) |
Cited By (3)
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USD382786S (en) | 1995-03-02 | 1997-08-26 | Black & Decker Inc. | Circular saw blade with heat vents |
USD383368S (en) | 1996-03-15 | 1997-09-09 | Black & Decker Inc. | Saw blade with vents |
USD388318S (en) | 1996-03-15 | 1997-12-30 | Black & Decker Inc. | Decorative vent pattern for circular saw blades |
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SE470397B (en) * | 1992-07-06 | 1994-02-14 | Sandvik Ab | Saw blades with radial slots and arcuate recesses for vibration damping |
US5285768A (en) * | 1992-08-28 | 1994-02-15 | Sanders Saws, Inc. | Two tier groove cutting circular saw blade with anti-undercut features |
FR2705600B1 (en) * | 1993-05-25 | 1995-08-25 | Mogavero Cosimo | Sawing organ. |
DE4328482C2 (en) * | 1993-08-24 | 1998-01-29 | Fgw Forsch Werkzeuge Werkstoff | Circular saw blade |
US5758561A (en) * | 1995-09-26 | 1998-06-02 | Black & Decker Inc. | Circular saw blade and method |
US5896800A (en) * | 1995-09-26 | 1999-04-27 | Black & Decker Inc. | Circular saw blade |
DE19735142A1 (en) * | 1997-08-13 | 1999-02-18 | Arntz Joh Wilh Fa | Saw blade |
DE19822742A1 (en) * | 1998-05-20 | 1999-11-25 | Arntz Joh Wilh Fa | Circular disc-shaped tool |
NZ504287A (en) * | 2000-05-02 | 2002-10-25 | Click Clack Ltd | Spiral ribbed circular saw blades |
DE20116110U1 (en) * | 2001-10-01 | 2001-12-06 | Arminius Gmbh Schleifmittel | Rotary grinding tool |
US6796210B2 (en) * | 2002-01-14 | 2004-09-28 | Kevin F. Baron | Cutting disc core for a circular saw blade |
JP4136893B2 (en) * | 2003-10-17 | 2008-08-20 | 兼房株式会社 | Disk-shaped tool |
US8146474B2 (en) * | 2004-02-17 | 2012-04-03 | Indigo Innovators, Inc. | Wood cutting saw chain and replaceable cutting members |
WO2005091877A2 (en) * | 2004-03-04 | 2005-10-06 | Ralph Neri | Cutter for scarifier device |
EP1570936A1 (en) * | 2004-03-05 | 2005-09-07 | Shinhan Diamond Industrial Co., Ltd. | Cutting wheel with blank and manufacturing method thereof |
JP4056485B2 (en) * | 2004-03-09 | 2008-03-05 | 株式会社ノリタケスーパーアブレーシブ | Dry cutting blade |
US7152596B1 (en) * | 2005-09-15 | 2006-12-26 | You Min Zhang | Circular saw blade body |
ITUD20070033A1 (en) * | 2007-02-16 | 2008-08-17 | Casals Herramientas Electricas Sl | CIRCULAR BLADE FOR WOODWORKING, OR OTHER MATERIALS |
US20090000132A1 (en) * | 2007-06-29 | 2009-01-01 | The Stanley Works | Reduced vibration saw handle |
US9463518B2 (en) | 2011-01-31 | 2016-10-11 | Black & Decker Inc. | Saw blade with reduced modal frequencies in the operating frequency range |
DE102011081415A1 (en) * | 2011-08-23 | 2013-02-28 | Robert Bosch Gmbh | sawblade |
DE102011082038A1 (en) * | 2011-09-02 | 2013-03-07 | Robert Bosch Gmbh | Saw blade, in particular rotary oscillation saw blade for a machine tool |
DE202013102690U1 (en) * | 2013-06-21 | 2013-07-01 | Albert Knebel Gmbh & Co. Kg Holding | Saw blade with a small sawtooth |
US10279407B2 (en) | 2015-10-30 | 2019-05-07 | Black & Decker Inc. | Circular saw blades |
USD813635S1 (en) | 2016-12-13 | 2018-03-27 | Black & Decker Inc. | Circular saw blade |
US11478951B2 (en) * | 2016-12-21 | 2022-10-25 | Seoul Laser Dieboard System Co., Ltd. | Cut-crease rule for dieboard |
AU2017418920A1 (en) * | 2017-06-12 | 2020-01-02 | Husqvarna Ab | A cutting tool and a method for producing the cutting tool |
CN107866756B (en) * | 2017-12-05 | 2019-03-19 | 长沙理工大学 | A kind of preparation method of orderly micro groove structure multi-player super-hard abrasive material electroplating abrasion wheel |
USD871878S1 (en) | 2018-05-14 | 2020-01-07 | Black & Decker Inc. | Diamond blade |
USD1002319S1 (en) * | 2022-08-31 | 2023-10-24 | Procut Tool, Inc. | Diamond saw blade |
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US2563559A (en) * | 1949-12-22 | 1951-08-07 | Meyers W F Co | Circular saw having vibration damping means |
US2990828A (en) * | 1960-09-19 | 1961-07-04 | Super Cut | Rotary segmental saw with rim rigidifying and silencing means |
US3363617A (en) * | 1964-08-28 | 1968-01-16 | Super Cut | Rotary segmental saw with rim rigidifying and silencing means |
US3513821A (en) * | 1968-02-05 | 1970-05-26 | Ferro Corp | Abrasive cut-off wheel |
FR2118263A5 (en) * | 1970-12-15 | 1972-07-28 | Penciolelli Georges | |
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FR2248685A5 (en) * | 1973-10-17 | 1975-05-16 | Norton Co | Cutter disc with diamond segments - has tapered engagement sections on segments and core teeth locking together |
SU872281A1 (en) * | 1980-02-29 | 1981-10-18 | Одесский Инженерно-Строительный Институт | Disc saw |
DE3220576A1 (en) * | 1982-06-01 | 1983-12-01 | BSB Biedron KG, 4630 Bochum | Diamond cutting-off disc, in particular for working natural or synthetic stone |
JPS5912563U (en) * | 1982-07-13 | 1984-01-26 | 旭ダイヤモンド工業株式会社 | Tip mounting structure of diamond cutting wheel |
BE897415A (en) * | 1982-07-29 | 1984-01-30 | Federal Mogul Corp | SLICING DISC |
DE3467323D1 (en) * | 1983-08-27 | 1987-12-17 | Heinrich Mummenhoff | Rotary saw blade |
JPS60167770A (en) * | 1984-02-09 | 1985-08-31 | Okayama Ishiku Center:Kk | Setting structure for tip in blade |
US4794835A (en) * | 1985-12-20 | 1989-01-03 | Kanefusa Hamono Kogyo Company Limited | Plate-like rotary body with vibration-suppressing characteristics and method of manufacturing same |
-
1989
- 1989-12-27 US US07/457,954 patent/US5012792A/en not_active Expired - Lifetime
- 1989-12-27 ES ES89313586T patent/ES2056234T3/en not_active Expired - Lifetime
- 1989-12-27 DE DE68916930T patent/DE68916930T2/en not_active Expired - Fee Related
- 1989-12-27 EP EP89313586A patent/EP0376676B1/en not_active Expired - Lifetime
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
USD382786S (en) | 1995-03-02 | 1997-08-26 | Black & Decker Inc. | Circular saw blade with heat vents |
USD383368S (en) | 1996-03-15 | 1997-09-09 | Black & Decker Inc. | Saw blade with vents |
USD388318S (en) | 1996-03-15 | 1997-12-30 | Black & Decker Inc. | Decorative vent pattern for circular saw blades |
Also Published As
Publication number | Publication date |
---|---|
US5012792A (en) | 1991-05-07 |
ES2056234T3 (en) | 1994-10-01 |
EP0376676A3 (en) | 1990-11-28 |
DE68916930D1 (en) | 1994-08-25 |
EP0376676A2 (en) | 1990-07-04 |
DE68916930T2 (en) | 1994-12-01 |
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